We present an upper bound on the error probability achievable using variable-length stop feedback (VLSF) codes, for a fixed size of the information payload and a given constraint on the maximum latency and the average service time. Differently from the bound proposed in Polyanskiy et al. (2011), which pertains to the scenario in which the stop signal is sent over a noiseless feedback channel, our bound applies to the practically relevant setup in which the feedback link is noisy. Numerical evaluation of our bound suggests that, for fixed latency and reliability constraints, noise in the feedback link may increase the minimum average service time for the VLSF scheme considered in this paper, to the extent that fixed-length codes without feedback may be preferable in some scenarios.

中文翻译：

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存在噪声停止反馈的变长码短包传输

我们提出了使用可变长度停止反馈 (VLSF) 代码可实现的错误概率的上限，对于固定大小的信息有效载荷以及对最大延迟和平均服务时间的给定约束。与 Polyanskiy 等人提出的界限不同。(2011)，它与通过无噪声反馈通道发送停止信号的场景有关，我们的界限适用于反馈链路有噪声的实际相关设置。我们界限的数值评估表明，对于固定延迟和可靠性约束，反馈链路中的噪声可能会增加本文考虑的 VLSF 方案的最小平均服务时间，以至于无反馈的固定长度代码可能更可取一些场景。